Following the characterization of the Alternaria species affecting potato (A. solani) and tomato (A. tomatophila) in terms of morphology and pathogenicity, and demonstrated that two species of Alternaria are responsible for early blight of tomato and potato, we applied this information in the pursuit of improving the selection of disease resistant tomato lines and hybrids. Genetic resistance to early blight and late blight has been fixed in tomato lines and these lines have been field tested to select for superior performance of earliness and yield potential in two locations in NY. Additionally we have initiated a screen program using some existing germplasm with notable traits to identify the highest level of resistance for Septoria leaf spot. Our goal is to develop tomato lines and hybrids with multiple disease resistance that would be adapted to NE growing conditions. Knowing that some fungicide use may still be required, we are working to pyramid genetic resistance with “lite” treatments which include biologicals or reduce risk materials. In potato we are working with a horticulturist to reduce the damaging effects of silver scurf, black scurf, black dot and most recently common scab by integrating seed and in-furrow treatments with foliar applications, and postharvest treatments such as with potassium sorbate salt. In addition to the use of salt solutions, we investigated the use of phosphoric acid solutions for oomycete control. We evaluate existing and new potato cultivars for their reaction to several diseases. For cucurbits we studied the epidemiology of bacterial leaf spot of cucurbits and verified methods to reduce the spread of bacteria via seed by evaluating several seed treatments. We continue to follow the control of powdery mildew in cucurbits in the face of continued loss of fungicides due to fungal resistance.